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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a1cea4eee7a76e6ec093cda90cfe1f3004d14e5aa07921c1397587ba02d812b' 
  AND token = 'Gx4EDJ+kAjsd2PQsP3hA+biHzv0JTV9/3MoEOuq6x4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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