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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84b3302ca6dead7cf3f8ce8843d6ddfba07f50247c4ba749307d6a00884e9708' 
  AND token = 'yasn2oJlWAgGPg6pOFjeGuDxF7yEVn2q3qTSvbqUWIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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