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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c93ec10e018a3c01d994529e7725461ab0b4573acb3b118f2fc0a516bba04cbf' 
  AND token = 've8sbcSTT+u4VUHWR4cjGaD1cNq+HZo5DGsf4bhtTwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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