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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86c54ca647facf6e32ffa10f23eb49b815df9084afe3030acf5f6a126828faad' 
  AND token = 'mhw4DbAwJ/7Yxg3EaL3RWdt5OyHFppxPXXD0fIqHQso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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