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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5982c660e5321c502531505485ceb1a96f3052db16888a4e3b5659f9d4a1b5c2' 
  AND token = 'w+qIQo/+T5j/JOAGO9L5eA3FRLZxz/nZE4XjSk2B03o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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