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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daeb03f52ecda0a2d432673ecb00be50c27dc6dc12e6d221fcfee1c916d14925' 
  AND token = 'X0I/ckp7Kt/xNFx6EGxs0W/FJDwC+l7JrqnBQzQInbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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