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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c24cb807dd146cba7cc62ef7b7a28c60804ab74740b6f765ece09e282acb6b9c' 
  AND token = 'TX+YzqsDu6FjOXrFvKmI8jSbRIIZJLB6d8nZjLozl7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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