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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a99bb490e2a6196fdfd10b6739f24dd9df95f710fd0abecb7a799d62976b772a' 
  AND token = 'PpnfD0Q+GKTi3qrulJVMxFmSk61I7k9rVV9hHxNZHSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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