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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3e77db81d7163f4de44086389d2696848ddc30e4cfd4e02aabf9822cf74c730' 
  AND token = 'RKPia3c3Za8qgI4xjzLIxfY/QbW+1l8qAGbf6ILeQeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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