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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ccb4c4df45dcaa4c6878feec40cbe91be1aca2f2002b0fa270eb274d85e9f3e' 
  AND token = 'fZb+gFZ6yP7OsR+2Dl+Bt47S4WwyZXWjrmxJ8AtUTlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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