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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b2df7c304bd08a45b0d3c45471fd2b12cdb22e2eaf3a0994eab5d5a58402df7' 
  AND token = 'TqlLKYlhOd7xLD5tmWVP97H7kNz8v8j0Rxuqdws0wh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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