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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cb08e1b33741712e54f3fc4d728b04df5492e5ae1e4d608bd24f815a877ac87' 
  AND token = 'mxvg7hakIpUB/zrBAE4b/P5R8M8QLR3jgQ5qfTL1LQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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