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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddaee26a7e900e84278c3859e9ad624147871a7a8adf674fe4f1ee4efbe81f34' 
  AND token = 'e8h3gCrr1kipLKaIhAwG64NiKD5yQs9VkmFbckiK/yY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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