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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ddee9a18c06a185298759f5ac656d89631986a3d9b9c1ceff5aa80ae9a9b5bb' 
  AND token = 'vU6rUUOyGUbtq1tIYWD3hd9CZ/DmdfDsywruiXelF94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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