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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cc63ce59b580401816cbb9b5fdf3e66a6f34584083ab3355fdb76e51c1c94b7' 
  AND token = '2hP/94RM1a17tIjJ3RyJMBWm5hd5gxc5uWzzD8jIy/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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