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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbda8bbbe6f81c4a511cc7a633d14c8500a6160dae5c0d1f2905839f4061a196' 
  AND token = 'w8KXXF9F6HF5Ep44JVUYTdGP3WgxR0DDq76F6r4t4Us=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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