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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f82800fb0e03da8297c5b42e9d65b9fb3fb03b2edb7661422a49623a6ab3f8b' 
  AND token = 'vcCK2A2Lp4i8FXFyNDIINxlgY6TGzW1TmyQcY2keTd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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