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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4788fb6774533213d09a78f236e35ebd49e6098a63f57713e41b59c1c3b54ae6' 
  AND token = 'QOQeBIEJ1bj2psM5ieTCyH9RxtMgc47bNTHe5MBy0eM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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