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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd01c53c24ac8d1d7b8fd44cec391bf56209f57a1596d7a7fdffdcbb29c9ce668' 
  AND token = 'GbbJJfmjcif5lGsTiGklJksFIa5JJxNGvy2Jf+Gy+pM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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