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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '792573ee88012bfcca5c8a1e84e7b0ab3aafbfa06dae7b6b080ef5595b493a86' 
  AND token = 'SAlgYQNcgjy51KQqdhiA1UBcIzBlHNYk8Gd1hWbrqHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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