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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '941667f9fbe8f99ab56d5cbc365f494150369dc62fa3d0d2c09742f267cc7b4d' 
  AND token = 'Hf1Rv6tIEjJueSiNRWwBU9aUppXj7SPuAmPvJKDHdyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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