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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bfb856d69b02f0258fd708e147d9ca29587049c5e9497e523940939eca64565' 
  AND token = '2fmKjoJZxHPnBoSCND5gpxSXEXFLPdzokxat8N6X3h8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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