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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5531f8b1c483e54b25ac10b9547de0c970607e8908c3750f2a56a5123a3290f' 
  AND token = 'xe/0q+jvk1G162nwSBwIfJK0AD0hIYvjR5Kr1f75Z7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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