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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fe15ab413a7a249c8cf621ecf82e6dabccb9fab9f8d5fff577aebe6c2b4dcfd' 
  AND token = 'xW1qrR9pD0ObQ/KIa4FCOU7Zn/29Yunyg84L37tYLwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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