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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c097e158d8e0fbf6760317f9af5c2b6ea83060c8ceedd9689955df7180825c4' 
  AND token = 'T+atuEqYFHYdJkOc+9tDrT1aGL9SvatBb5cQrdR+N7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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