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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed7008927ef7735cb5f6e86edcf1ca830e8cb06c5c692e2c36fedc3bc9170b2c' 
  AND token = '0tShiK05c6evkKKoDWuWcu6HuVE6gU2npmF/obcLBIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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