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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d2e0e840c4b6b3ff505653e245fa94f6311d58eecf1bf79d4b8cd1e5e97413c' 
  AND token = 'OYlfKtvCZPkSATk4mJlG7ybhYnb7joUXrSBPy69Z/2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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