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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '714b872c22c28e1cd726d69a6a66a71457a7c94d0e1a20484fdce7452b69bce0' 
  AND token = 'QPAFVFh9rDAsFfknbqO+dlCfO3KcV0IZSfwYhE6lWRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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