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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13ca66927c508c2fd96f3a80acf6396b2032c59d2b1f7984a1b0c2b4874d76fb' 
  AND token = 'cohpSjMg8zHoOivh3GRkhnyM/4MJxiMi93rtImqK6sA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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