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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '868348f1d59962481b8d3aa48fa01e03b2246503d8474363f7096be6578608d1' 
  AND token = 'E4e7mMRFnGpg7d8eX/RSrCOlbAnDgi3R+InpdRddDOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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