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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d7332ca391fbdb8065bafa8ea46a94f7d72e57a1ab2f498b62067808c5ad445' 
  AND token = '2rH29lB/X9e2DEfrHw8fJeap0I0JtFarfuU99WOcTTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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