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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be0252c25589cdb586f1ce33c7a539e172dfbd187f28ebb1950a3f8a90ba6c5e' 
  AND token = 'LaLLj1bZilEmPAAmE0An03WqYJeoPLwF8Hgi2IQRLEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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