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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b65f55ec5c47bef6c73474d8a48766ffede8e58be5f7a1d1cedcea3c563c520b' 
  AND token = '1ztDF/s/hAARQof9ioGWfouSizzTfnk7E2xVWn4CwaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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