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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2ca221c78304d1e86e70b29f3b6ccb6cbb84d70b5bdee3470b6736d14aebff1' 
  AND token = 'qyDDIeRjwmVM4m6S8zveFDqdz7RV5b6Vb/chHEDoilk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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