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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f1722451dd0d910b4922acc1aa87f406ae948dbc6fa9030343731f9cf6c87ab' 
  AND token = 'mM6e1UMS6883zF8vKY4WpgU4QsPp80+htD0RcmPptCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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