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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf0f9e18cacc74f336f9126aab2172d3741427252bbf24759992c4386d29733d' 
  AND token = 'WmWNjOIL4k2iVzI1Jjc4UC3ENasHzEo2/wWTjRhUTUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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