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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f207fd508564f6a5c4abcc0000985b05b2e8f8a84d2b24472ab18d20e19bd4b4' 
  AND token = '5jo8HhINImlt8tYW/tP/NhjY7PI2hiIMb03fonKqVMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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