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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '778343fe52e67d742bbc53c0186fcb9699187f8d7e46ba2897d424125d560670' 
  AND token = 'Th7eocGazmsUSaHiQ2LKr5tNRQeYRPU6yuzaSy7so38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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