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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bec2f97d15cb2e1f9c7b6382f13d55fc489f8b2c9fc55125f6e688523063403' 
  AND token = '5nrXs/GbQteyCCAAOfV64I14D3Teb2XOWuOHr3Im/lk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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