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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8befbd164c8e460e1425ae19c11ed89f45a79adcd623dbb39bc4565376ac5fed' 
  AND token = 'A4Elr8omjJvMTVXQJHWEWx8QNQKza86VkgcVivNEV+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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