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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7049ff96da79f1198b32752d82587fac1b3260223099fcc72923d2c2ad14ea6' 
  AND token = '2W7PcHqpUr/+rnZqrVn4SUN+3QAICXtEVX+J8bu84NA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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