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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9818c723c8ce19c35073be8128d66b53df180fe217f83778984b00f077dbfed' 
  AND token = '3qg2FonJxGSCmbj6YUwsK//UZxclQn9Ro9xleaTMAwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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