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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8345e197ced3cf1771c00f4dc47136ae9b60beefddada047903cfb8417907500' 
  AND token = 'Oyo2AcwiC+VsxDsEObQL5f51sJ5BvAlkwc7RtXiIK1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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