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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa89fee70c04a51630786b21544501bcdaf543b3e9cf17804a5582ed61beb273' 
  AND token = '5YfxrO399Ea0n3itmCzPwwy22IfbG0e+BCDanPhpfy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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