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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a91ad5cce40e0677fea7e88db1ca6b85a85b272fd763342523971bc938ccccfd' 
  AND token = 'kJJw0UIZI90tfkO4n3Uy9pPhaRXrvznNrswN5hqeJlo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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