SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e52cc61d7e24d12f245aa86fef80a958e758276598dced98b0c551e4227f6b4e' 
  AND token = 'qpyVFUHXZBzXw2IunIgZGMSvNH+vd/HJloDX2KsJxNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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