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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1addb39e27bc1b4a0a8d92705336f4e3c06dcca1d915ef3f8acd63251801cf4c' 
  AND token = 'jT37y8J0sRBKxHcmzE7DZjFTLmR3CBB+Uk3an+Rk1AQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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