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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '007b7df395dce3081232e67d5e9a8d55c81acda3024547d6700b63e33fe89513' 
  AND token = 'KjLPSDB2XM6BboHyUxtH6nztI23jdn1E9qH4kYAt3Cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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