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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44d8eadf028ebe08983b74147b575561844b087eca9f18b037d621647f82a6b8' 
  AND token = 'Eeei2BM+HLzWXPKmoKwqhv9veimd+6lXuaH27Jc4ZAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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