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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38de8b807272dde26559906718e9516035fe43f0ba329b5205315f23d10f4098' 
  AND token = 'HUM1ZvvadD5WtKsCpgQiWL3VTnGOJoEli16t8uDZnek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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