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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd82685fca1485bf19a08f82df44dd5391b9cf7d7e1a060137a4c8a9dc795b530' 
  AND token = 'Oc1ECWLo8EOR1XMsphEeng+MfoJvJ3fKwWYCIPuoleg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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