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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5512bd94ef920c7595027c7b8cd6a7d141fd52f6888a0f9745bafdecfd085013' 
  AND token = 'ittFg3Q3FMazLbPjrYn125lSJ4mPxcb2wmy42TsVd9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}