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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2b3709d84e84db358020d8963a91d1229790ffeeadf404b29f15eb222245e01' 
  AND token = 'fxl2ucXwEQlf2+E8cJ0YTWNCpycY8nRMvXr2qv668Ww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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