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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '219badeb53917cce0d67afcb7926bed5a26dd0fa5962f4fe6715f92601ea2282' 
  AND token = 'O9kGPaFKDpKLPXyPsR1eoCgWgPAlWpw1dPO2QFCYycE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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