SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e352ee877da3e58270f17a9cd0695463ac87976d2c103a2370d642b555a2c4c4' 
  AND token = 'X41Ya+fEYdSUlYSc0bVH7uh4gKuC+By3twcrcEUaJ/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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