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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cece140ea66764dd72f8a4e9d3c43442f7627efe343a1cccc423b78069b3d7e' 
  AND token = 'ZhvTCgI8TNEahsua1y416Cjv64znpH5YhsFO/U8wfmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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