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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cc3504342643e9c29bb2b4a6b5882c9e7ecb3f5101d232c36029e44b516ed02' 
  AND token = 'dTP8Tq2Num6Od+K111KkHbnpoTddcNbxxiKI26IY+Js=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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