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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2b2eac2c35c5f8d9e03db768a4105ae5b615bb40408271dc90d3a4c6dd7791e' 
  AND token = '5Fyjp4vBBua1OB/9LpYIj+MVQVdtaSDhr1WeJqW4u6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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