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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec07b148d035c24f67e820e3ef5187f5dea1943ce56d0439669cf0a04b9ca81b' 
  AND token = '9ShAr0DXuogwqGgIC7KR5aRbb84YpRNDd+NKgKOhws0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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