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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11af96e74648a6eac14a60ab87f318d2ca38062f1de2b46948ea769abffc3c92' 
  AND token = '79nPp3kVxevFzrS4FVFRhSIkZfoMXVm9kx1kxxSlCwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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