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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '762e041889fcf5befde0f7fd56a21ae91c1072d1af9d9d57a09e1eda02b15083' 
  AND token = '7/1PiMHz5JK9dWqyrDclmgSRxmIgc0pYxMxuoieaxXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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