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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c9275b55cae909f48d471420ffcb52dace3a22223499e84f1d113805d2367f9' 
  AND token = 'sTOq9y1JVo6w8c7PdyKeH049Ok3mSV3dGBEbg5J0WOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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