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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53f0ffe10eb6718c049cd3b3308c5867a9793bfbf6cda9832487c10c718e195a' 
  AND token = 'ygLYcGHs3Ws4QEPvjGy3Lwb4u4Wxnpnrl0VUpD7y/68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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