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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ede916d5f70745d715331e5e35ca88255075c0a47fc4b9ae04d646531ee48732' 
  AND token = 'S9ZztC8rUNhVbcJHyhPx4kqu7K6/88QDz6Pkw+Mg1zE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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