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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6696ff0f8f9cd19a9766ff8d456ac776c9f305c5886580fb06bdb04a54edd1c8' 
  AND token = 'kDBT//5EYApkIiyBisy/1+kyVJOl/RJ+ZaDBaaFKB8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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