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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fad6271d5a86504f160294260fcbb4e7f2e3b9500b5b43b76befb1ac97bef660' 
  AND token = 'oXX6NrI7Q2koZL35bqBZvfbAb9njQj7+4+0scj4K93A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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